[Aldo_MX]

Then you get burglars in your shop instead of legitimate customers.

User Agents look the way they do because this is a recurring issue.

A browser without network effects gets blocked, they look for a way to bypass the blocking, then they become mainstream and now the de-facto UA is larger than before.

[TheRealPomax]

Fun fact: you can't steal paid software by faking a user agent, because that's not how sales work. But you can lose sales by blocking user agents.

And use your brain for a hot second will you? Bad actors don't use a rare user agent, they use the same Chrome user agent that everyone else uses.